base.py 文件源码

def __init__(self, title, url, attrs=None, item_id=''):
        super().__init__()
        self._parent = None
        self._item_id = item_id
        self._title = str(title)

        try:
            self._url = resolve_url(url)
        except NoReverseMatch:
            self._url = url

        if attrs is None:
            self._classes = ''
            self._attrs = ''
        else:
            self._classes = attrs.pop('class', '')
            self._attrs = flatatt(attrs)